I got the DIY X Plus One from Kick Starter, once finish building I tried to arm the motors without success. The MultiWii GUI shows that when I move the left stick down to the right, it arms but once I connect the battery and arm, the motors won’t start! I also tried to adjust the TX end points as well as the MIN & command THR in the GUI and on the TX itself but no luck. However, if I keep on trying to arm, I may get 1 out of 10 times. Next I was trying to calibrate the ESC, using all at once method (Tx on, Thr UP, connect battery, Thr DOWN, disconnect battery, etc) to no avail. I did try to use the Arduino config.h to calibrate the ESC but the compiling yields too many error that I can’t fix them all. Then I had to carve open the X Plus One foam belly to get access to the RX and the Nano Wii FC and individually calibrate the ESC via the RX. I still can NOT arm the motors. Then I remember when I connected it to the MultiWii software, I was able to arm the motors with the USB connected every time! Now come the experiment time, I just connect the USB power supply (not MultiWii via PC) to the NanoWii, then connect the battery and I can arm the motors!! At this point, I remember somewhere that a person posted a clip saying that he has to apply the power to the board too. Note also that, even if I just connect only the battery pack, I can see the red/blue led on the board just like I connect the power via the USB connector on to the board meaning the FC gets the power from the RX. Another strange behavior is that, once I connect the power to the board’s USB then the battery pack, I can arm the motors and remove the USB power and still able to arm. And if I remove both the USB and the pack and reconnect just only the pack within a few minutes, I can still arm! However, if I let it sit without power for over, say 30 minutes and connect only the pack, I won’t be able to arm. Finally, I had to cut open the belly again and run the extra power from the RX to the NanoWii and everything works fine now. Any idea why this happened?